You'll need your hot water bottle tonight. Met Eireann says temperatures will drop between 0 and 2 degrees in Dublin, resulting in widespread frost.
It's set to be even colder in other parts of Ireland with lowest temperatures falling to between -1 and +2 degrees tonight.
It looks like the chilly weather will continue for the rest of the week. Wednesday will be mainly dry and bright with some rain and drizzle in the afternoon and highest temperatures of 10-13 degrees.
There'll be some rain on Wednesday night in the west and north with lows of 7-10 degrees.
Thursday will be mainly dry with highs of 12-15 degrees. Thursday night will be breezy with some rain and lows of 9 to 12 degrees.
Rain is forecast for Friday. The forecaster says it looks like it will turn brighter and cooler later in the day with fresh northwest winds.
The weekend is set to be mainly dry, cool and bright with frost likely at night.